2531699857 has 16 divisors (see below), whose sum is σ = 2766152592. Its totient is φ = 2307604480.

The previous prime is 2531699809. The next prime is 2531699867. The reversal of 2531699857 is 7589961352.

2531699857 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 50316²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 178382736 + 2353317121 = 13356^2 + 48511^2 .

It is not a de Polignac number, because 2531699857 - 2¹¹ = 2531697809 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2531699798 and 2531699807.

It is not an unprimeable number, because it can be changed into a prime (2531699867) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82233 + ... + 108745.

It is an arithmetic number, because the mean of its divisors is an integer number (172884537).

Almost surely, 2^2531699857 is an apocalyptic number.

It is an amenable number.

2531699857 is a deficient number, since it is larger than the sum of its proper divisors (234452735).

2531699857 is a wasteful number, since it uses less digits than its factorization.

2531699857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26708.

The product of its digits is 4082400, while the sum is 55.

The square root of 2531699857 is about 50316.0000099372. Note that the first 5 decimals coincide. The cubic root of 2531699857 is about 1362.9211750930.

The spelling of 2531699857 in words is "two billion, five hundred thirty-one million, six hundred ninety-nine thousand, eight hundred fifty-seven".